Seam for sewed articles



Sept. 8, 1931. N. v. CHRISTENSEN SEAM FOR SEWED ARTICLES Filed Aug. 4.1950 2 Sheets-Sheet l N. v. CHRISTENSEN 1,822,799

SEAM FOR SEWED ARTICLES 7 Sept. 8,- 1931.

, 7 Filed Aug. 4, 1930 2 Sheets-Sheet 2 Patented Sept. 8, 1931 UNITEDSTATES PATENT. OFFICE NORMAN V. CHRISTENSEN, OF CHICAGO, ILLINOIS,ASSIGNOR T UNION SPECIAL MA- CHINE COMPANY, OF CHICAGO, ILLINOIS, A.CORPORATION OF ILLINOIS SEAM FOR SEWED ARTICLES Application filed August4, 1930. Serial No. 473,007.

The invention relates to new and useful improvements in a seam for sewedarticles, and more particularly to a flat seam adapted to join knittedfabric sections.

An object of the invention is to provide a seam wherein the edgeportions of the fabric sections are lapped and the cut edges of thematerial completely covered with a relative-- ly small quantity ofstitching thread.

A further object of the invention is to provide a seam of the above typewherein the cut edge of the material is concealed on one face of thefabric by infolding the material, and on the other face of the fabric bythe stitching threads.

In the drawings Figure 1 is a View in perspective showing more or lessdiagrammatically a two needle loop seam embodying the invention whereina plurality of looper threads are used for ping sections of the fabric.

The invention is directed to a seam forsewing fabrics, and particularlyknit goods.

The fabric is cut to proper dimensions and the edge portions to be oinedare lapped. In order to conceal the cut edge of the fabric on the rightor face side'of the scam the outer edge portion is folded underneath.The two edge portions thus arranged relative to each other are stitchedby a stitching mechanism including at least two needles, one of whichpasses through the folded portions of the outer lapping fabric section,and the other of which passes through the outer lapping section only andon a line adjacent the cut edge of the under fabric section. The needleloops are secured by one or more looper threads so arranged that theyextend from one line of stitching to the other and thus cover the cutedge of the under fabric section. It is not easy to int-urn the loweredge of the fabric section of knit material as the tendency of the cutedge portion is to roll or curl inwardly and away from the outer lappingsection.

Referrin more in detail to the drawings, the two'fa ric sections to beunited are indicated at 1 and 2. The section 2 is referred to as theouter section as it is the section on the right side or face of thefinished seam. This fabric section has a cut edge 3, and the edgeportion is folded underneath as indicated at 4. The fabric section 1 hasa cut edge indicated at 5. The two fabric sections are arranged flat soas to overlap each other, The inturned portion 4 terminates short of thecut edge 5 of the under section 1.

As shown in Fig. 1 the-fabric sections are united by. two needle threads6 and 7. The needle thread 6 is formed into a series of loops 8, 8 whichare passed down throu h the two fabric sections and through t e foldedportion of the fabric section adjacent the edge 9 thereof. The needlethread is formed into a series of loops 10, 10 which are passed downthrough the fabric section 2 only. These loops lie close to the cut edge5 of the under fabric section 1. As shown in this figure the'needleloops 8 are locked by a looper thread 11. The looper thread 11 is formedinto a loop 12 which is passed both the needle loops 8 and 10 which passthrough the looperthread loop 12 also pass through this looper threadloop 14. Thus it is that the needle loops 8 and 10 are locked and thelooper threads extend across the cut edge 5 and effectively cover thesame.

.In Fig. 2 of the drawings the fabric sections 1 and 2 are provided withan inturned one section lying flat on the other.

edge 4 and are arranged as in Fig. 1 except that the cut edge 5 of thefabric section 2 is disposed at a greater distance from the cut edge 3of the inturned portion 1. The fabric sections thus formed are united bythree needle threads 15, 16 and 17. The needle thread 15 is formed int-oa series of loops 18, 18 which are passed through both fabric sectionsadjacent the folded edge 9 in the outer fabric section 1. The needlethread 16 is formed into a series of loops 19, 19 which are passedthrough both fabric sections at one side of but adjacent the cut edge 3of the inturned section 4. The thread loop 17 is formed into a series ofloops 20, 20 which are passed through the fabric section 1 only outsideof and adjacent the cut edge 5. The needle loops 18 in the under face ofthe fab- .ric are locked by a. looper thread 21. This looper thread 21is formed into a loop 22 which is passed through a needle loop 18 and isexpanded so that the next two formed needle loops 18 and 19 will passthrough said loop The needle loops 19 are locked by a looper thread 23.It is formed into a series of loops 2 1. These loops are expanded sothat the next two formed needle loops 18 and 19 which pass through thelooper thread loop 22 will also pass through the looper thread loop 24.The needle loops 20 are locked by a looper loop 25. The looper thread isformed into a series of loops 26, and a loop is passed through a needlethread and is then expanded so that the next two ric sections are joinedby needle threads 6' and 7 formed respectively into a series of loops 8.8 and 10, 10 as in Fig. 1. In this form of seam the needle thread loopsare secured by a single looper thread indicated at 26. Said looperthread is formed into a series of loops 2?. One of these loops is passedthrough a pair of loops 8 and 10 for securing the same. The loop 27 isentered by the next formed needle loop 10 and thus locked. The strand 26of this looper thread loop is carried around the next formed needlethread loop 8 and locked thereby. In this seam the looper thread extendsat right angles across the cut edge 5, and said out edgeis covered bythe strands of the looper thread loops expanding from one line of needleloops to the other. Thus it is that the edge is completely covered bythe stitching threads.

In the form of construction shown in Fig.

4 two fabrics are arranged as in Fig. 2, and similar numerals have beenapplied thereto. The fabric sections are secured together by threeneedle threads 15, 16 and 17 which are formed respectively into loops18, 19 and 20. This arrangement of the needle threads is precisely thesame as in Fig. 2. The needle thread loops are however secured by asingle looper thread 28. This looper thread 28 is formed into a loop 29which is passed through all three needle thread loops 18, 19 and 20. Itpasses first through the loop 20, then 19 and then 18, and the end ofthe looper thread loop is arranged so that the next formed needle threadloop 18 will pass through the same and lock the looper thread loop. Thestrand 28 is carried laterally so that the next formed needle loops 19and 20 will pass inside of the strand. Thus it is that the looper threadloop is secured and the strands of the loop spread out so as to bettercover the under face and particularly the out edge 5 of the fabricsections.

From the above it will be apparent that a flat seam has been providedwhich is especially adapted for uniting knit fabrics and particularlythin knitted fabrics such as rayon silk. On the right face of thematerial there are needle threads only. There is no covering threadnecessary to cover the raw edge as it is in turn concealed between thetwo looped portions of the fabric section. The raw edge of the underfabric section is secured flat against the outer fabric section and nointurning is necessary. This raw edge is covered by the looper threads.In Fig. 1 of the drawings the seam is formed by two needle threads andtwo looper threads and in Fig. 3 the seam is formed by two nee dlethreads and one looper thread. In Figs.

- 3 and 4 a center row of needle thread loops are employed which passthrough both fabric sections and thus a very much stronger fiat seam isproduced. With this center of line of stitching concealed there is nocovering thread needed or used as on the outer face the raw edge isconcealed by being inturned between the fabric sections.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent, is

1. A seam for sewed articles comprising fabric sections arranged withtheir edge portions overlapping each other, the outer fabric sectionhaving its edge portion inturned so as to conceal the edge thereofbetween said fabric sections, a series of needle thread loops passingthrough both fabric sections adjacent the fold in the inturned fabricsection, a series of needle thread loops passing through the outerfabric section only adjacent the edge of the inner fabric section, andlooper thread loops securing said needle thread loops and extendingacross from one series of needle thread loops to the other and coveringthe edge of the under fabric section.

2. A. seam for sewed articles comprising fabric sections arrangedwlththelr edge portions overlapping each other, the outer fabric sectionhaving its edge portion inturned so as to conceal the edge thereofbetween said fabric sections, a serles of needle thread loops passingthrough both fabric sections adjacent the fold in the inturned fabricsection, a series of needle thread loops passing through the outerfabric section only adjacent the edge of the inner fabric section, a

third series of needle thread loops passing through both'of said fabricsections midway bet ween the two rows of needle thread loops outside ofand adjacent the edge of the inturned portion of theouter fabricsection,

and looper thread loops securing all of the needle thread loops andextending across from one series of needle thread loops to the other andcovering the edge of the under fabric section.

In testimony whereof, I afiix my. signature.

NORMAN V. CHRISTENSEN.

